Now that the f8 keynote has passed, everyone is wondering why Facebook didn’t launch a check-in feature. The reality is that check-ins are just a hack – a workaround for the fact that smart phones are still pretty dumb when it comes to location – at least in terms of the features that App developers can freely use. Smarter devices, near-field communication (NFC), better applications and more savvy advertisers are going to revolutionize how we go about our daily business.